The Sun & Stars

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Across
  1. 7. The closest neighboring star system.
  2. 9. The energy that shoots out from the sun, in the forms of heat & light.
  3. 12. The largest star by diameter...just under 2,000 solar radii
  4. 13. A red supergiant, located in Orion constellation. It may supernova soon.
  5. 16. One who studies space & the stars.
  6. 19. Our sun is this type of star.
  7. 21. The color of the sky.
  8. 22. The only star in our solar system.
  9. 24. Closest stellar nursery.
  10. 25. It lights the Earth, but does not produce the light, only reflects it.
Down
  1. 1. The brightest star in our sky.
  2. 2. A soup of ionized atoms.
  3. 3. The root word that means "light".
  4. 4. The Greek word part for "sun".
  5. 5. The pattern of the sun's maximums & minimums of sunspots.
  6. 6. An instrument used to see stars better (bigger).
  7. 8. Greek for "equal to Mars" because it also appears red.
  8. 10. A catastrophic explosion of a dying star.
  9. 11. The galaxy our sun & solar system is in.
  10. 14. The outermost layer of the sun's atomosphere.
  11. 15. An interstellar cloud of gas & dust.
  12. 17. The Latin word part for "sun".
  13. 18. The most massive star, R136a1, is in this nebula.
  14. 20. When hydrogen atoms COMBINE to form helium atoms at the core.
  15. 23. The Hertzsprung-Russell Diagram categorizes stars based on their...